Doesn't quite answer your question, but have you thought about doing away all together and just having a box for shelter - Scamp has an 18" square cardboard box and that's his only 'cage'. You can go a bit bigger/wooden. Or just use the tray out of the dog crate and a box on that for shelter. It will seem smaller even if the floor pad is the same.
The main benefit to a cage for a free range bunny is the shelter/safe space and a cage with bars isn't that useful for that anyway.
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